The Roman Catholic Diocese of Bielsko–Żywiec (Latin: Bielscen(sis) – Żyviecen(sis)) is a diocese located in the cities of Bielsko and Żywiec in the Ecclesiastical province of Kraków in Poland.It was established as the Diocese of Bielsko–Żywiec from the Diocese of Katowice and Metropolitan Archdiocese of Kraków on 25 March 1992.